I am one of those who started with an AI on my 600mg cycle (12.5 aromasin eod in my case), felt like shit, dropped it and improved.
I am also a low aromatizer by nature though, and even without the AI, only hit high 60s on said 600mg cycle.
So yeah, never again.
I don’t plan on pushing huge amounts of test, as there are just better AAS to build cycles around, so if I’m good with no AI at 600, the 300-500 I’ll be using as a base from here on is just fine.